DNA barcoding of sigmodontine rodents: identifying wildlife reservoirs of zoonoses

PLoS One. 2013 Nov 11;8(11):e80282. doi: 10.1371/journal.pone.0080282. eCollection 2013.


Species identification through DNA barcoding is a tool to be added to taxonomic procedures, once it has been validated. Applying barcoding techniques in public health would aid in the identification and correct delimitation of the distribution of rodents from the subfamily Sigmodontinae. These rodents are reservoirs of etiological agents of zoonoses including arenaviruses, hantaviruses, Chagas disease and leishmaniasis. In this study we compared distance-based and probabilistic phylogenetic inference methods to evaluate the performance of cytochrome c oxidase subunit I (COI) in sigmodontine identification. A total of 130 sequences from 21 field-trapped species (13 genera), mainly from southern Brazil, were generated and analyzed, together with 58 GenBank sequences (24 species; 10 genera). Preliminary analysis revealed a 9.5% rate of misidentifications in the field, mainly of juveniles, which were reclassified after examination of external morphological characters and chromosome numbers. Distance and model-based methods of tree reconstruction retrieved similar topologies and monophyly for most species. Kernel density estimation of the distance distribution showed a clear barcoding gap with overlapping of intraspecific and interspecific densities < 1% and 21 species with mean intraspecific distance < 2%. Five species that are reservoirs of hantaviruses could be identified through DNA barcodes. Additionally, we provide information for the description of a putative new species, as well as the first COI sequence of the recently described genus Drymoreomys. The data also indicated an expansion of the distribution of Calomys tener. We emphasize that DNA barcoding should be used in combination with other taxonomic and systematic procedures in an integrative framework and based on properly identified museum collections, to improve identification procedures, especially in epidemiological surveillance and ecological assessments.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Wild / classification
  • Animals, Wild / genetics*
  • DNA Barcoding, Taxonomic / methods*
  • Phylogeny
  • Zoonoses / classification
  • Zoonoses / genetics*

Grants and funding

This research was financially supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). PCE was funded by CAPES-CNPq-PROTAX and by PDJ CNPq FIOCRUZ 500091/2010-2. G. L. Gonçalves received CNPq fellowship (141604/2007-7). This study was supported by BrBOL: Brazilian Barcoding of Life under project Tetrapoda. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.